Spring-motor.



F. G. MAYER.

SPRING MOTOR.

APPLICATION FILED AUG.3I. 191a.

Patented Jan. 14, 1919 2 SHEETSSHEEI I.

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SPRING MOTOR.

APPLICATION FILED AUG-3|,19l8.

1,291,061. V Patented Jan.14,1919.

2 SHEETS-SHEET 2- fi (a u Egg-2. 5 13 5 I? 7 U7 /HW H W5 v I! J I F .3. I W A [I 7 7 U& V. V I n\ W 11 Clflozmeqa y M /a 0% Y i onions onen ss isnsrnnr onrion FEEX) G. MAYER, Q EIGHMOND, INDIANA, AfiSIGNOR TD STARR PIANO COMPANY, OF

RICHMOND, INDIANA, A GDRQPOHATION OF INDIANA.

SPRlNG-MOTGR.

Specification of Letters Patent. Patenteed $3111.14, 1919.

Application filed August 31, 1918. Serial No. 252,149.

To all whom it may concern Be it known that L'Fnrn G. lvlnrnn, citizen of the United States, residing at Richmond, Indiana, have invented certain new and useful Improvements in Spring- Motors, of which the following is a full,

le end exact description.

o; driving the turn tables of phonogrsplis,

'hut applicable generally for all analogous purposes, and the primary object of the new construction is to make the spring barrel in such motors grease-tight when motor is in proper suspended position, so that under theseconditions of use they will absolutely retain its lubricant, therefore insuring a smooth and quiet unwinding of thesprings, also, remain perfectly. clean, and free from eny oil or grease on the outside of the barrel or other parts.

In the case of motors of the general charocter with which this application deals, it is usual to employ-s mixture of graphite, oil and grease in the spring barrel or barrels,

two springs in tandem being ordinarily used,-in order that the springs map unwind smoothly and without noise and jumps, but no form of'motor has yet been devised, or at least commercially used, in which there was any adequate provision for preventing the escape leakage of this grease through the hearings or otherwise from the barrels. This hm been a cause of great annoyance and trouble to overcome it I have devised a form of spring motor in which the greenscontaining barrels are rease-tight and free from any joints through which any such sub stances can find. their wey out.

This device is shown in the accompanying drawings in which:

Figure 1 is a view in elevation of n spring motor'showing it as applied to e phonograph. Fig. 2 is a vertical cross-sectional View of the spring barrels, and Fig. 3 is a simih View of o modification of the some parts. s In construction, operation and modeof e the 3lPttYfifhllS differs in no essential respects from thewell hnown tandem springinotors now commonly used with phonogrephs; that is to say, there are two spring-barrels 3 end 2, with a centrel'sheft 3, each s rin'r'heing connected at one end to its barre and other to the shaft To barrel 1, which "turns in or with reference to her-rel 2, a gear 4 is inventioi'n is on improvement in motors such as are customarily used at the that drives the turn-table 6 of a phonograph.

These parts in general construction and function being, as above stated, old and known.

My improvement consists in this: The outer or main barrel 2 I form by stamping, as shown in ig. 2, or by casting or molding, as shown in Fig. 3, a cup, havnw a central hole in the bottom, it stamped, through which projects the lower end of the shaft 3, which end fits in a socket-in a plate 7 of substantial thickness secured tightly to'the bot tom of the cup.

The under or outer side of the plate 7 is formed with c socket 8, which containsn bell-bearing, one member of which is madjustable screw 8 set in or passing up through the base plate 9 of the phonograph frame or support.

The outer cup 2 is united tothe plate 7 and the geor 5 by screws 10, so that its rotary movenient hy the unwinding of the springs is imparted to the phonograph table.

In the lower part of the cup 2 the spring 11 is contained. Theupper part of the cup is enlarged in diameter and contains the barrel 1 with its spring 12, and the upper and lower compartments of said cup 2 are separated by a plate 13. v

The upper barrel 1 is bottomless but has n closed integral top containing only s central hole to allow or. the passage of the shaft 3. The outer cup or barrel 2 is stopped and flanged at the top, and the inner or upper barrel 1 fits snugly the some and turns therein.

When the thickness of the walls of the cuter herrel'fi are sufficiently thick to permit it, the inner edges of the staggered portion or shoulders at the top are formed with 45 w at a considerable elevation above the grease which is contained in the spring barrels.

When the outer or main barrel 2 is cast in a mold, it is readily made in one piece-with a socket in its bottom for the shaft 3, as shown in Fig. 3, and the socket for the ballbearing may also be formed in the bottom as shown; This and other details of construction', however, are not of the essence of my invention, which, from the above de seription will be seen to reside in a closed spring barrel or barrels, with no passages to the'exterior for the possible leakage of its oily or greasy contents.

1. A grease-tight motor comprising acentral shaft and two superposed springs in tandem, in combination with an outer or main barrel with closed bottom in which the shaft is set, and an inner barrel with closed to 7 containin theu er sn'in and fittin" p r h C and turningin the upper part of the main barrel. v

2. A grease-tight motor comprising a central shaft and two superposed springs in tan dem, in combination with an outer or main barrel int-losing both springs and formed with a closed bottom having a socket therein 'in.\\'hieh the shaft is set, and an inner barrel containing the upper spring and having a closed top through which the shaft passes, and adapted to tit and turn in the upper part of the main barrel.

3. A grease-tight motor comprising a central shaft and two superposed springs in tandem, in combination with a main or outer barrel .inclosing both springs and formed with a closed bottom having a socket therein for the end of the shaft and a socket beneath it for a ball-bearing,- and an inner barrel with closed top containing the upper spring and adapted to lit and turn in the upper part of the main barrel. T

4. A grease-tight motor comprising a'cent- 'al shaft and two superposed springs in tandem, in combination with a main or outer barrel surrounding both springs and formed .in one piece with a closed bottom in which the shaft is set, and an inner barrel containing the upper spring, having a closed top and adapted to tit and t n-n in the upper part of the main barrel.

5. A grease-tight motor comprising a central shaft and two superposed springs in tandennin combination with a one-piece main barrel with closed bottom and the upper part .of larger diameter than the lower, an inner barrel contained in the enlarged portion and surrounding the upper spring, said barrel signature.

FRED G. MAYER. 

